Bucket
Specifies encryption-related information for an Amazon S3 bucket that is a destination for replicated objects. If you're specifying a customer managed KMS key, we recommend using a fully qualified KMS key ARN. If you use a KMS key alias instead, then KMS resolves the key within the requester’s account. This behavior can result in data that's encrypted with a KMS key that belongs to the requester, and not the bucket owner.
Properties
Specifies the ID (Key ARN or Alias ARN) of the customer managed AWS KMS key stored in AWS Key Management Service (KMS) for the destination bucket. Amazon S3 uses this key to encrypt replica objects. Amazon S3 only supports symmetric encryption KMS keys. For more information, see Asymmetric keys in KMS in the Key Management Service Developer Guide.